Velký Hodonický rybník Nature Reserve and Mapped Protected Wetland Landscape in South Bohemia

The history of Velký Hodonický rybník is closely tied to the management challenges of a small upland fishpond. In the twentieth century, poorly designed drainage works upstream of the pond repeatedly deprived it of water, allowing its margins and shallows to be colonized by reed sweet-grass (Glyceria maxima). As a result, large parts of the pond lost their open-water character and the original aquatic vegetation was suppressed.

A turning point came in the 1990s, when a new inflow was redirected into the pond. Although this did not guarantee full refilling, it improved water levels enough for the reed sweet-grass to retreat. During repairs to the outlet in 1997, the exposed pond bottom germinated a large cohort of white water lily seedlings. When water levels rose again in subsequent years, the water lily population declined sharply and almost disappeared. By the time the site was declared a protected natural monument, the population had stabilized at roughly one hundred individuals, and the fishpond was being managed by the company Rybářství Nové Hrady.

The protected area was formally declared on 26 October 2023 by the Regional Authority of the South Bohemian Region, in the category of natural monument, marking the culmination of decades of hydrological instability and ecological recovery at the pond.

The protected area sits in a gently rolling spring area of a small right-bank tributary of the Hodonický potok, within the broader Novohradské podhůří highlands. The terrain is only mildly undulating, and the pond occupies a shallow depression in the upper part of this small catchment at an elevation of roughly 630 to 631 meters above sea level. The visual character of the site is shaped more by water and wetland margins than by dramatic relief, with the small open water surface set against wooded slopes and agricultural land typical of the South Bohemian foothills.

Geologically, the pond basin overlies Holocene sediments with a thin peat layer, beneath which lies cordierite-bearing biotite paragneiss of the Moldanubian basement. The surrounding soils reflect the wet conditions: pseudogley cambisols dominate the slopes, while gleys and organosols appear closer to the water. The combination of shallow peat, fine sediments, and a shallow water column creates the soft, waterlogged setting that defines both the scenery and the ecology of the site.

Ecologically, Velký Hodonický rybník is a mesotrophic water body typical of the cooler upland regions of Bohemia, a habitat type that has become relatively scarce in the modern Czech landscape. The pond supports a layered aquatic and wetland vegetation, with the protected white water lily at its center and a wider cast of wetland plants filling the marginal zones.

Beyond its flora, the pond serves as a key breeding and refuge habitat for amphibians and dragonflies adapted to nutrient-poor but oxygen-rich standing water. Its condition fluctuates with water levels, which directly affects the balance between reed sweet-grass, open water, and submerged vegetation. The simultaneous ecological pressures of traditional fish culture and conservation management create a delicate equilibrium that defines the natural character of the site.

The wildlife interest of Velký Hodonický rybník centers on odonates and amphibians that use the shallow pond and its margins as breeding habitat. Among dragonflies, the site hosts several species listed on IUCN red lists, notably the yellow-spotted whiteface (Leucorrhinia pectoralis), the common hawker (Aeshna juncea), the scarce emerald damselfly (Lestes dryas), and the small emerald damselfly (Lestes virens).

The pond also supports a diverse amphibian community. Smooth newt and great crested newt have been caught at the site, along with common frog, pool frog, and agile frog. Calling males have confirmed the presence of the pool frog species complex and the European tree frog. Together, these species underline the role of the fishpond as a small but ecologically rich refuge for wetland-dependent fauna in the Novohradské podhůří.

The principal conservation value of Velký Hodonický rybník lies in its surviving population of the white water lily, a strongly threatened species whose presence is the formal subject of protection. The protected vegetation community, classed as mesotrophic water vegetation of cooler regions with white water lily, covers about 18 percent of the protected area and forms the legal core of the site.

In addition to the water lily, conservation targets include several odonate and amphibian species, including yellow-spotted whiteface, smooth newt, great crested newt, agile frog, pool frog, and European tree frog, together with other typical wetland plants. The site's full overlap with a European Site of Community Importance places it within the Natura 2000 network and gives it additional international recognition. Management aims to maintain stable water levels suitable for the white water lily and its associated community, balancing traditional fishpond use with the requirements of rare aquatic species.

Velký Hodonický rybník is a small South Bohemian fishpond whose protected status hinges on a remarkably focused conservation target: the population of white water lily and the mesotrophic wetland community that supports it. Its overlap with a European Site of Community Importance gives a modest 2.71-hectare site an outsize role within the Natura 2000 network of the Czech Republic.

The pond also illustrates the resilience of traditional Bohemian fishpond landscapes. Despite repeated drainage problems in the twentieth century, the site has recovered enough to host a stable water lily population and a rich assemblage of dragonflies and amphibians, making it a quietly significant example of how small, historically managed water bodies continue to anchor regional biodiversity.

The pond's character shifts with the seasons in ways that affect both its scenery and its ecological visibility. Late spring and early summer are typically the most rewarding period for observing aquatic vegetation and dragonfly activity, when water levels tend to be more stable and temperatures support both odonate flight and amphibian breeding choruses. Summer also brings the warmest conditions in this upland setting, with daytime temperatures in the mid-teens to high teens Celsius under the regional climate classification.

Winter brings frozen surfaces and a snow cover that can last for several weeks to a few months, transforming the small pond into a quiet feature in an otherwise snowy landscape. Because the site is a working fishpond and a protected natural monument, visits are best framed as low-impact nature observation rather than as tourism activity, and visitors should generally avoid disturbing the marginal vegetation and shoreline that hold the most sensitive species.